As seen above, the main GPU Core copper heatsink comes with a spread of fine copper fins which provide a good amount of surface area for heat spreading. The warm air from the heatsink is blown through the IceQ3 duct and exits via the PCI Exhaust vent seen below:

The back of the card, looking very close to that of X1800XL and XTs:

I wanted to take off the cooler and check out the BGA GDDR3 memory below the heatsink but it seems HIS went with a special screw assembly, which requires a special Allen Key to open: